Actress Toni Collette joined director Ari Aster at the Sundance Film Festival London screening of their film Hereditary. Touted as the scariest film since The Exorcist, Hereditary follows the Graham family as they start to unravel following the death of their reclusive grandmother.

The debut feature by writer/director Aster, Hereditary has been frightening audiences since it first screened at Sundance’s Utah festival in January. We spoke with Aster about the reaction to his sensational horror: